[Registrar] Remove obsolete description of premium domains (#17432)

Cloudflare Registrar currently supports premium domains.
https://community.cloudflare.com/t/premium-domain-support/423699/31

Author: Gentry Deng

src/content/docs/registrar/get-started/register-domain.mdx

@@ -31,8 +31,6 @@ If you are registering a `.us` domain, refer to the [Additional requirements for
 
 Cloudflare Registrar currently does not support internationalized domain names (IDNs), also known as unicode. For that reason, you cannot search for words with special characters, such as `à`, `ü`, `ç`, among others.
 
-Cloudflare Registrar also cannot register premium domains, that is, domains that have non-standard pricing.
-
 
 :::
 

src/content/docs/registrar/get-started/transfer-domain-to-cloudflare.mdx

@@ -83,7 +83,6 @@ Sites can be unavailable for a few reasons, including:
 * You did not [add your domain](/fundamentals/setup/manage-domains/add-site/) to your Cloudflare.
 * The site was registered in the last 60 days.
 * Cloudflare does not yet support the TLD.
-* The domain is designated as a premium domain by the registry.
 * The domain has a status that does not allow for a transfer.
 * You failed to follow the steps highlighted above in [creating an account with your domain](/fundamentals/setup/account/create-account/) and [changing your DNS nameservers to Cloudflare](/dns/zone-setups/full-setup/).
 

src/content/docs/registrar/top-level-domains/index.mdx

@@ -15,7 +15,7 @@ Cloudflare supports over 200 [top-level domains (TLDs)](https://www.cloudflare.c
 
 :::note
 
-If you want to register a `.us` domain refer to  [Additional requirements for .US domains](/registrar/top-level-domains/us-domains/). 
+If you want to register a `.us` domain refer to  [Additional requirements for .US domains](/registrar/top-level-domains/us-domains/).
 :::
 
 ## Domain availability
@@ -25,7 +25,6 @@ During your [TLD registration process](/registrar/get-started/register-domain/#h
 Possible causes for the domain not being available include:
 
 * Someone else owns that domain.
-* It is a premium domain, that is, one with non-standard pricing, which Cloudflare Registrar does not support.
 * It is an Internationalized Domain Name (IDN) which Cloudflare Registrar does not support. These domains include international characters (such as `á`, `ü`, among others).
 
 ## Transfer a domain

src/content/partials/registrar/restrictions.mdx

@@ -8,12 +8,11 @@
 To transfer your domain, it must meet the following requirements:
 
 * ICANN rules prohibit a domain from being transferred if it has been registered or previously transferred within the last 60 days or if the WHOIS Registrant contact information was modified in the last 60 days (even if redacted).
-* Your account at your current registrar must be active. If your domain has expired, you may be able to transfer the domain. If the domain is in the `RedemptionPeriod` you will likely need to restore the domain first before the transfer can proceed. 
+* Your account at your current registrar must be active. If your domain has expired, you may be able to transfer the domain. If the domain is in the `RedemptionPeriod` you will likely need to restore the domain first before the transfer can proceed.
   :::caution
 
-  The transfer of an expired domain may result in an additional year NOT being added during the transfer. 
+  The transfer of an expired domain may result in an additional year NOT being added during the transfer.
   :::
-* Your domain cannot be a premium domain as Cloudflare currently does not support them. Some registries designate a domain name as premium and charge higher wholesale rates for these domains. In most cases Cloudflare is able to identify premium (non-standard priced) domains during the transfer eligibility step. However, this check might fail. When this happens, Cloudflare will not be able to determine the domain's premium status until the transfer is initiated.
 * Your domain cannot be an internationalized domain name (IDNs) as Cloudflare does not currently support them. These domains are also known as unicode.
 * Domains that have a status of `serverHold`, `serverTransferProhibited`, `pendingDelete`, `pendingTransfer`, or `RedemptionPeriod` may not be transferred.
 * Domains that have a status of `clientTransferProhibited` (Transfer Lock) will not show as available for transfer. You will have to unlock the domain at your current registrar before being able to proceed.